Concrete-roof form



May 11 1926. 4

P. RUTTEN CONCRETE ROOF FORM Filed Dec. 28, 1925 2 Sheets-Sheet 1 Inventor R27 7 Fuzim Attorney 'P. RUTTEN CONCRETE ROOF FORM May 1 1 1926.

Filed Dec. 28, 1925 2 Sheets-Sheet 2 V/// all a;

F r r. w

Attorney Patented May 11, 1926.

UNITED s'rAriEs PETER RUTTEN, F OSAKIS, MINNESOTA.

CONCRETE-ROOF Form.

Application filed. December 28, 1925. Serial No. 78,042.

'The present invention relates to improvements in concrete molds or forms, and is more particularly adapted to a form for use in constructing a concrete roof on any circular building, such as silos, grain bins,

corn cribs, water tanks, and the like.

Ordinarily in constructing cement roofs on such circular buildings, the form which is used must necessarily remain as a part of the roof after the cement has been filled in and hardened, thus making it necessary to build a new form for every such roof constructed.

One of the salient features of the present invention is to obviate the necessity of having to construct a new form for every roof which is to be built, thus enabling a single form for constructing any number of concrete roofs for circular buildings.

A further object is to provide a concrete roof form which may be readily and easily set up in position for use, the same being further adapted to be adjusted withlrespect to the diameter of the building on which the roof is to be constructed.

A further object is to provide a concrete roof form .which is simple in construction, inexpensive, strong, and durable, and further well adapted to the purpose for which it is designed.

Other objects and advantages of the invention will become apparent during the course of the following description taken in connection with the accompanying drawings.

In the accompanying drawing forming a part of this application and in which like numerals designate like parts throughout the several views:

Figure 1 is a top plan view of the form showing the manner in which the same is placed on the open top of a circular-build ing preparatory to constructing the concrete roof. 7

Figure 2 is a sectional view showing the form in use, and in the'manner in which a concrete roof is constructed.

Figure 3 is a fragmentary detail perspective view of the staging plank. Y t

Figure 4 is a detail perspective view of one of the rafters, and V e Figure 5 is a detail perspective view of one of the roof boards.

In the drawings, wherein for the purpose designates the relatively small collar or ring. A series of angular brackets such as are shown at 2 have their shorter arms secured to the outer face of the ring or collar, and these angular brackets extend rear wardly from the collar as is clearly illus- 'trated in Figure 1. A series of rafters are secured at their inner ends to the longer arms of the respective brackets through the medium of the fastening bolts 4. The inner end of each rafter 3 is provided with the longitudinally extending slot 5 through which the fastening bolts extend whereby the rafter may be moved inwardly or outwardly with respect to the collar 1. Each rafter is further provided with the longi tudinally extending slots .6 and 7 in the outer end and intermediate portions thereof I respectively as is more clearly illustrated in tending slots 6 provided therefor in the outer end portion of each rafter. Similar brackets 12 provide a means for securing the inner series of header bars through the intermediate portions ofthe adjacent rafters and the securing bolts associated with the brackets 12 extend through the longitudinal slots 7 provided therefor in the intermediate portion of the respective rafters. One of the header bars of each of the outer and inner series respectively comprisesthe overlapping sections 13 and 14- respectively, which are adjustably secured together by suitable fastening bolts 15 which extend'through longitudinally ex,- tending slots formed in the sections. It is of course understood that the outer ends of the sections are secured to the respective rafters. The purpose of this construction. is to provide a means of taking care of any excess variation.

The outer ends of the respective rafters have secured thereon the stirrups 16,'the same being adapted to engage the upper edge of the circular building A such as a silo, grain bin, water tank, or the like, and on which a pyramidal shaped roof is to be constructed. As is clearly shown in Figure 2, the radially extending rafters 3 are disposed downwardly so that the collar or ring 1 is supported at a suitable height above the upper edge of the building.

The form embodying my invention furthermore includes the frame 17 which is secured at its ends to the inner face of the collar 1 at diametrically opposite points. This frame is preferably formed of strap iron. A bolt 18 extends upwardly through the bottom and top portions of the frame, and the threaded portion of the bolt 18 extends above the top of the frame for a suitable distance. Suitable lock nuts 19 are associated with the bolt to prevent its displacement from the frame. The purpose of this bolt will be more fully described later.

A plurality of roof boards 20 are adapted to be placed over the frame work formed by the rafters and the header bars 8 and 9, and each of the roof boards is in the form of a sector such as is more clearly illustrated in Figure 5 of the drawings. The inner pointed ends of the roof boards come together around the bolts 18 at a point directly above the frame 17, and the outer ends of the roof boards terminate adjacent the outer ends of the rafters as is more clearly illustrated in Figure 2. The roof boards when arranged on the upper side of the frame provide a means for forming a foundation for the concrete roof which is to be constructed.

For the purpose of forming the cornice, there is provided a series of separable bands 21 which are adapted to have their adjacent ends adjustably secured together as illustrated at 22, the completed band encircling and being clamped around the outer face of the circular building adjacent the upper edge thereof as clearly shown in the drawings. The boards 23 which form a foundation or base for the concrete which forms the cornice are adapted to be supported in a horizontal position on the brackets 24 which are secured to the outer face of each of the sections 21, the inner edges of the boards being cut to conform to the contour of the outer face of the circular building. The upper face of each of the boards 23 lie substantially flush with the upper edge of the building A as clearly shown in Figure 2.

A relatively large band 25 has its lower edge resting on the outermost portion of the laterally disposed portions of the angular brackets 24, and the inner face of this band abuts the outer edges of the cornice forming boards 23, the outer face of the band 25 being engaged by the upstanding fingers 26 formed on the outer ends of the laterally disposed portions of the angular brackets 24, as is clearly shown in Figure 2. In this manner, the band 25 will be supported in a vertical position.

\Vith the form arranged on the open top of a concrete circular building in the manner as shown and above described, with the roof forming boards and the cornice forming boards in position on the form, the concrete is placed on these boards, and if desired, any suitable reinforcing means may be embedded in the concrete during the formation of the roof. A strike oif board 27 is secured at its inner end to a suitable bracket 28, the same being adapted to rotate on the shaft or bolts 18 between the nuts 29. The outer end of the strike off board 27 is slightly bent and extends beyond the band 25. The purpose of the strike off board 27 is to provide a means for forming the concrete roof of uniform thickness and the board is so arranged as to enable the same to be easily swung around over the upper face of the poured concrete in an efficient manner.

A suitable derrick designatt d generally by the numeral 30 is employed for delivering the concrete and other material used in forming a roof, to the person constructing the roof on top of the building, and this derrick is also adapted for swinging movement through the medium of the bracket 31 which is secured to the inner end of the horizontally extending arm of the derrick, said bracket being disposed over the shaft or bolt 18, suitable lock nuts being threaded on the upper end of the bolt to prevent the displacement of the brackets 28 and 31 therefrom. A supporting leg 32 associated with the outer end portion of the horizontally disposed arm of the derrick and ahook 33 is carried by the extreme outer end of the horizontally extending arm for attaching the usual block and tackle thereto.

Access to the form from the inside of the building, may be easily had through the medium of the provision of the adjustable staging planks 3st and 35 respectively, the outer ends thereof resting on suitable staging brackets 36 which engage over the upper edge of the building, a suitable clamp 37 holding the inner overlapping ends of the planks together.

The provision of a form of the above mentioned character will enable pyramidal shaped roofs of plastic material to be constructed on buildings without necessarily having to include the form as a part of the roof such as is now usually the case. Thus a single form may be employed for constructing any number of roofs, and it is readily understood that as soon as the roof has hardened, the form may be readily and easily disassembled and removed from the building and again used. This will save considerable expense in roof construction, and furthermore the simplicity of my de vice enables the parts to be readily and easily assembled, and furthermore adjusted to accommodate its use upon buildings of different diameters While I have shown the preferred embodiment of my invention it is to be understood that minor changes in the size, shape, and arrangement of parts may be resorted to without departing from the spirit of the invention and the scope of the appended claims.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent is l. A form for constructing concrete roofs of pyramidal shape on a building comprising a frame, the latter including a collar, a a series of rafters extending radially and downwardly therefrom, connecting means between the rafters, stirrups on the outer ends of the rafters adapted to detachably engage the upper edge of the building, a series of roof boards supported on the frame, the outer ends of the boards being disposed flush With the outer ends of the rafters, additional means for forming a cornice, said last mentioned' means comprising a band encircling the upper portion of the building, a series of cornice boards, supporting brackets therefor attached to the band, and an additional band supported in a vertical position on the brackets and extending around the outer edges of the last mentioned boards.

2. A form for constructing concrete roofs of pyramidal shape on a building comprising a frame, the latter including a collar, a series of rafters extending radially and clownwardly therefrom, connecting means between the rafters, stirrups on the outer ends of the rafters adapted to detaehably engage the upper edge of the building, a series ofroof boards supported on the frame, the outer ends of the boards being disposed flush with the outer ends of the rafters, additional means for forming a cornice, said last mentioned means comprising a band encircling the upper portion of the building, a series of cornice boards, supporting brackets therefor attached to the band, an additional band supported in a vertical position on the brackets and extending around the outer edges of the last mentioned boards, and a rotatable strike off board associated with the form for forming the roof and the cornice of uniform thickness.

3. A form for constructing concrete roofs of pyramidal shape on a building, comprising a frame, the latter including a Collar, 21. series of rafters extending radially and downwardly therefrom, header bars secured between the adjacent rafters for holding the latter in spaced relation with respect to each other, stirrups on the outer ends of the rafters adapted to detachably rest on the upper edge of the building, a series of roof boards extending radially over the frame, the outer ends of said boards being lush with the outer ends of the rafters, a band adjustably secured around the upper portion of the building, a series of cornice boards, supporting brackets for said boards attached to the outer face of said band, said cornice boards being adapted to be disposed horizontallyon the laterally disposed portions of the brackets, the upper faces of the boards lying flush with the upper edge of the building, the inner edges of the boards abutting the outer face of the building, an additional band supported vertically on the laterally disposed portions of the brackets and engaging the outer edges of the cornice boards, and upstanding fingers formed on the outer ends of the laterally disposed portions of the brackets engaging the outer face of the vertical band. 7

In testimony whereof I afiix my signal are.

PETER RUTTENr 

